Ventilating hood



Y July 7,- 1959 K. s. JENSION ETAL 2,893,305

VENTILATING noon '2 Sheets-Sheet 1' Filed na 2:5, 195s J y 7, 1959 K. s.JENSON ETAL 2,893,305

VENTILATING HOOD Filed May 23, 1956 2 Sheets-Sheet 2 United StatesPatent VENTILATING HOOD Kenneth S. Jenson and Mathias Roth, WisconsinRapids,

Wis., assigiors to Preway, Inc., a corporation of Wisconsin ApplicationMay 23, 1956, Serial No. 586,763 9 Claims. c1. 98-115) This inventionrelates to ventilating hoods and blowers for installation inkitchens orthe like, particularly over cook stoves, for exhausting smoke, cookinggases, and the like from the kitchen. a k I It is a general object ofthe invention to provide new and improved apparatus of the characterdescribed.

A more specific object is to provide a new and improved ventilating hoodfor installation over a cook stove, constructed for housing an exhaustblower unit, and provided with novel means for use in mounting theblower unit therein. 6

-Another object is. to provide .a new and improved blower unitconstructed for installation in a ventilating hood and provided withnovel means which readily adapt the unit for mounting and dismountingrelative to the hood.

It is also an object of the invention to provide a new and improvedventilating hood and blower unit of the character described wherein thehood and blower unit are constructed so that the blower unit is readilymount away, of a combination ventilating hood and exhaustv blower unitembodying the principles of the present invention;

Figure 2 is an end 'elevational view illustrating the. structure ofFigure 1 installed on a kitchen wall or.

thelike; Y

Figure 3 is a bottom planview, partly broken away, of the structureillustrated in Figures 1 and 2;

Figure 4 is an enlarged vertical sectional view taken at about the lineof 4-4 of Figure 1; t

Figure 5 is a fragmentary sectional view, with parts broken away, takenat about the line 5-5 of Figure 4;

Figure 6 is a fragmentary sectional view taken at about the line 6--6 ofFigureS; and

Figure 7 is a fragmentary plan "view, partly broken away, ofthe blowerunit, taken at about the line 7--7 of Figure 6. e

While an illustrative embodiment of the invention is shown in thedrawings and will be described in detail herein, the invention issusceptible of embodiment in many different forms and it should beunderstood that the present disclosure is to be considered as anexemplification. of the principles of the invention and is not in:tended to limit the invention to the embodiment illustrated. .The scopeof the invention will be pointed out in the appended claims. p I

Referring now to the drawings, as illustrated, the invention is embodiedin a ventilating hood including a canopy, generally designated 8, afilter box 9 under the canopy, and a blower unit 10 (Figs. 4 and 5)adapted for installation in the filter box. The canopy is formed bymeans of a rear wall 11, a top wall 12 extending forwardly from the rearwall, end walls or side walls 13 ex- 5 ice from the top wall, and afront wall 14 extending downscreen or mesh 37 supported at its perimeterby means of longitudinally extending frame elements 38 and con-I wardlyfrom the top wall between the end walls 13. The

walls of the canopy 8 may be connected to form a unitary structure byany suitable means, such as by spot welding overlapping flanges of thewalls; and the rear wall 11 may be provided with suitable holes forreceiving screws, toggle "bolts, or the like (not shown), for use inattaching the canopy to a supporting structure, such as a kitchen wallor the like illustrated at 15 (Fig. 2), in position over a cook stove,for example, for collecting gases and smoke rising from the stove.

If desired, a splash plate such as that illustrated at 16 may be mountedon the supporting structure 15 in a position extending downwardly fromthe rear wall 11 of the canopyto collectspattering' greases from thestove.

'Theblower unit 10 (Figs. 4 and 5) functions to exhaust gases collectedunder the canopy 8 to a suitable exhaust flue, and filter box 9, inwhich the blower unit is housed, functions to filter the grease ladengases to avoid'excessive collection of grease in the exhaust fan or fansand the fan motor. The filter box 9 is centrally located under thecanopy 8 and defines an exhaust chamber including a rear wall and a topwall formed respectively by portions of the rear and top walls lland 12of the canopy 8. The filter box 9 includes side walls 20 positioned inspaced relationship to the end walls 13 of the canopy and extendingforwardly from the rear wall 11 and downwardly from the top wall 12. Tophorizontal edges of the side walls 20 are formed with inwardly turnedflanges 21 and the vertical rear edges of .the side walls 20 (Fig. 4)are provided with inwardly turned flanges 22 which may be utilized insecuring the side walls 20 to the rear and top walls 11 and 12 by meanssuch as the bolts and nuts illustrated at 23. The

filter box 9 includm a bottom wall 25 which may be secured as by weldingto inwardly turned flanges 26 on the side walls 20. The construction ofthe filter box described thus far leaves a relatively large area ofopening at the front of the filter box through which the blower unit 10may be inserted and retracted for mounting and dismounting in the filterbox. The open front area referred to is adapted to be closed afterinstallation of theblower unit by means of a rectangularly shaped filterelement 30 and a removably attachable filter box cover 31.-

As seen in Figure 4, the horizontal top edges of the side walls 26terminate at a midportion of the canopy top wall 12 and thereafterextend in a forwardly and downwardly inclined direction toward the frontof the canopy. The bottom horizontal edges of the side walls 20 alsoterminate short of the front of the canopy and thereafter extend in aforwardly and upwardly inclined direction toward the front of the canopyto a meeting point with the forwardly and downwardly inclined edges. Asseen in Figures 1 and 4, the forwardly and downwardly inclined edges ofthe side walls 20 are provided with inwardly directed channels having anupper flange 35 and alower flange 36 defining tracks at opposite sidesof the filter box for receiving the filter element 30. H

The filter element 30 comprises a rectangularly shaped nectedtransversely extending frame elements 39. The filter element isinstalled in and removed from the filter box by slidable movement of thetransversely extending frame elements 39 in the channels defined byflanges 35 and 36. The filter element 30 may be suitably retained inposition in the channels by spring slips 40, one carried by each of theflanges 35 in a manner to bear against the frame elements 39 so as toretain the filter element but permit its removal slidably.

box cover in mounted position as'illustrated and permit its'removalmanually without the needof external: means suchas tools, either specialor conventional,'or retaining means such as screws; Accordingly, to thisend", the bottom upwardly and forwardly inclined edges of the side wallsare each provided with an inwardly turned flange 45 (Figs. 3 and 4).Each of the flanges 45 is provided with a pair of longitudinally spaced,rectangularly shaped; elongated openings or recesses 46 therethrough.For cooperation with the flanges 45 and recessesv46, the cover member 31is provided with integral spring-like clip members 47 adapted to' fitthrough the recesses 46 when the cover. member 31 is placed against theflanges 45, and adapted to latch over portions of: the flanges 45' toreleasably retain the cover member when. the cover member is slidablymoved in a direction rearwardly and downwardlyrelative to the front ofthe canopy. As seen in Figure 3, the cover member may be provided with acentrally located, elongated opening 519 closed by suitable transparentmaterial 51 for transmitting light downwardly from bulbs 79 associatedwith the blower unit. Also, at the rear edge, the cover member 31 isprovided with a centrally located rectangular cut out portion 52 adaptedto leave exposed for access switches 53 and 54 projecting from the endof a wiring box 55' associated with the blower unit installed in thefilter box. The switches 53 and 54 may be connected in circuit forcontrolling the blower motor and the light fixture. It should be notedthat when the cover member 31 is properly mounted asillustrated, itsforward edge portion functions to as sist in retaining the filterelement against inadvertent removal from its proper position.

Air drawn into the filter box through the filter element 30 is exhaustedfrom the filter box through a rectangularly shaped exhaust outletopening 57 in the top,

wall 12 and having at its perimeter an upstanding flange 1 58 adaptedfor connection to a suitable exhaust flue (not shown) leading from theroom in which the installation is made.

As best seen in Figures 4, 5, and 7, the blower unit 10' adapted forinstallation in the filter box 9 includes a fan motor having a housing60 and a motor shaft 61 projecting from opposite ends of the housing.Oppo-. site end portions of the motor shaft 61 have mounted thereonrespectively squirrel cage fan wheels 62 secured to the motor shaft asby set screws such as that illustrated at 63. The fan wheels 62 areencased respectively in scroll shaped fan wheel housings 65 each securedto the motor housing 60 by means such as that illustrated at 66 whichmay include bolt, nut, and washer means. Each of the scroll shaped fanwheel housings 65 is. provided at the side. opposite the motor housing60 with a centrally located axial air inlet opening 67 through which airis drawn into the fan wheel housing from the exhaust chamber formed bythe filter box 9 and to the center of the fan wheel. The inlet opening67 is provided by an annular closure member 68' secured to the scrollshaped fan wheel housing by screws illustrated at 69, and the annularclosure member 68 may be removed to provide access into the housing forremoving. the fan wheel from the. motor shaft 61. Each of the. scrollshaped fan wheel housings includes a ter-v minal. portion 70- forming atangentially directed outlet duct adapted to register with the outletopening 57 in. the: top wall 12'of the filter box. The fan wheel housversely extending plate 71 formed with openings 72 therethrough inregister with the ends of the outlet ducts 70. The plate 71 may beconnected to the outlet ducts by means of downwardly extending flanges73 telescoped inside the outlet ducts 70 and welded thereto, forexample. The plate 71 includes portions about the perimeter of the ducts70 which form flanges 75 and 7 6 extending respectively rearwardly andforwardly from the ducts 70 (Figure 6) for a purpose that will bedescribed in detail presently.

The wiring box 55 previously referred to is an elongated box ofrectangular cross section rigidly connected at opposite sides of itsupper end to the fan wheel housing 65 respectively as by means of weldsindicated at 77. The wiring box 55 thus mounted between the fan wheelhousing 65 extends downwardly andsomewhat rearwardly from between thehousings-'65 in a direction substantially opposite the direction of theducts 70. The

wiring box 55 includes wiring connected with the fan motor and withswitch 53 for controlling energization of thefan motor. The wiring box.55 is provided with a lightingfixture 78 which as illustrated is adaptedto. re

ceive a pair of light bulbs 79; The fixture 78 is connected in circuitwith the switch 54 for controlling energization of the bulbs 79. Theswitches 53 and 54 are connected in circuit with an extension cord 80leading from the wiring box and having at its free end a plug 81 adaptedto fit a receptacle 82 provided in the upper rear corner of the filterbox for connection with a source of power available at the installation.

According to the invention, the blower unit 10 is adapted to beremovably mounted and retained in the filter box' solely by means ofinterengageable parts on the blower unit and the filter box so that theunit may be installed and removed entirely manually without thenecessity of external means such as tools, either special orconventional, or retaining means such as screws and the like.Accordingly, to this end, the top wall 12 of'the filter box is providedwith a downwardly projecting locking part in the filter box in the formof an elongated metal strip 85 which includes a portion 85a (Fig. 6)welded or otherwise secured to the top wall 12 and an angularly bentportion 85b engageable by the flange 76 on the plate 71 for use inretaining the blower unit in position in the filter box. To describe thefunction of the parts- 85b and 76, when the filter box cover 31 and thefilter element 30 are to be removed from the filter box, the blower unit10 may be grasped manually at the forward portion of the housings 65,for example, and pivoted in a counterclockwise direction, as viewed inFigures 4 and 6, so as to move the blower unit in a direction forwardlyand away from the top wall 12 to dislodge the flange 76 from itsengagement with the locking part 85b, after which the unit may be movedforwardly out of the filter box- Similarly, in installing the blowerunit, it is first moved rearwardly into the filter box and upwardly toengage the flange 76 with the part 85b after which the unit may bepivoted in aclockwise direction until the plate 71 engages the top wall12 of the filter box, whereupon the plate 71, including the flanges 75and 76, is confined between the locking part 8511, the top wall 12, andthe rear wall- 1 1.

To assist in maintaining the blower unit in proper position in thefilter box, the forward edge of the bottom wall 25 of the filter box isformed with an upwardly turned flange 87 (Figure 4) which presentsforwardly facing and rearwardly facing surfaces engageable by partscarried on the blower unit. The forwardly facing surface on the flange87 is abutted by the rearwardly facing surface of the wiring box 55 atits lower end so as to limit movement of the lower end of the blowerunit rearwardly in the filter box. A book 88 pivotally mounted on thewiring box 55 is positioned so as to be latched ings 65 are arranged in.parallel relationship: and the.

over the flange 87 engaging the rearwardly facing surface I with theflange 87. It will be appreciated that when the hook 88 is latched overthe flange 87, there can be no pivotalmovement of the blower unit aboutthe point of contact between the flange 76 and the part 85b, and sincethe part 85b prevents movement of the flange 76 downwardly, the blowerunit is consequently securely held in the proper position. a

'We claim: 1. In a ventilating apparatus of the character described, anexhaust chamber formed of a rear wall, a top wall,

depending side walls, anda bottom wall, and having a chamber, a blowerunit adapted for installation in the exhaust chamber through saidentrance openingincluding a motor driven fan for drawing gases into theexhaust chamber and an exhaust duct having a terminal portion adapted toregister with said outlet opening for exhausting gases from the chamber,and means for re- 1 leasably retaining the blower unit in position insaid exhaust chamber comprising interengageable parts one on the blowerunit duct and one on said top wall of the exhaust chamber forming adisengageable pivotal connection pivotally hanging and supporting theblower unit 1 for'pivotal movement thereof on said top wall in a forwarddirection for removal of the unit,. and cooperating parts on the blowerunit and at least one wall of the exhaust chamber other than said topwall forming a disengageable latch means releasably retaining the blowerunit against the aforementioned pivotal movement including a latch parton one of the blower unit and said other wall and a pivotable latchmember on the other of the blower unit and other'wall.

2. In a ventilating apparatus of the character described, an exhaustchamberformed of a rear wall, a top 1 wall, depending side walls, and abottom wall, and having an opening at the front for admitting gases tothe chamber and for permitting installation of a blower unit in thechamber, the top wall of'said chamber being formed with an outletopening for exhausting gases from the chamber, a blower unit adapted forinstallation in the exhaust chamber through said front opening including a motor driven fan for drawing gases into the exhaust chamber and anexhaust duct having an upper, terminal portion adapted to register withsaid outlet opening for exhausting gases from the chamber, and means forreleasably retaining the blower unit in position in said' exhaustchamber comprising a locking part extending downwardly from the top wallof the exhaust chamber and having an upwardly and rearwardly facingsurface defining with the top and rear walls of the chamber a confiningspace for use in mounting the blower unitin the exhaust chamber, aforwardly extending flange on the terminal portion of said outlet ductengageable with said surface for retaining the end of the exhaust ductin positionlbetween said surface, said top wall and said rear wall butpermitting pivotal movement of theblower unit about the point ofengagement between said flange and said surface in a direction forwardlyand away from said top wall for removal of the unit, a locking part onthe forward edge of the bottom wall of the exhaust chamber havingengageable forwardly facing and rearwardly facing abutment surfaces foruse in mounting said blower unit in the exhaust chamber, an abutmentpart on the blower unit engageable with said forwardly facing abutmentsurface, and a hook on the blower unit engageable with said rearwardlyfacing abutment surface for maintaining said abutment part in engagementwith the forwardly facing abutment surface. r

3. In a ventilating apparatus of the character described, an exhaustchamber formed of a rear wall, a top wall, depending side walls, and abottom wall, and having an opening at the front for admitting gases tobe exhausted,

6 the top wall of said chamber being formed with an outlet opening forexhausting gases from the chamber; a

blower unit for installation in, said exhaust chamber,

through said front opening including a fan motor having a housing and amotor shaft with opposite shaft ends projecting from the housing, a pairof fan wheels mounted respectively on the opposite ends of said motorshaft to be driven thereby, a pair of scroll shaped fan wheel housingssecured to the motor housing and encasing respectively the fan Wheels,said fan wheel housings each having an axial air inlet opening and atangentially directed terminal portion forming an outlet duct adapted toregister with said outlet opening, and a plate rigidly connecting saidoutlet ducts; means for releasably retaining said blower unit inposition in said exhaust chamber comprising interengageable parts one onsaid plate and one on said top wall forming a disengageable pivotalconnection pivotally hanging and supporting the blower unit for pivotalmovement thereof in a forward direction for removal, and cooperatingparts on said blower unit 7 and said bottomwall forming disengageablelatch means releasablyretaining said blower unit against said pivotalmovement including a latch part on said bottom wall and a pivoted latchmemberon the blower unit.

4. A ventilating hood, comprising: a canopy including a rear wall and atop wall and open atthe bottom for collecting rising gases; a filter boxunder thecanopy for exhausting gases from the canopy including a rearwall and a top wall formed respectively, by portions of the rear and topwalls of said canopy, depending side walls,

and a bottom wall, and open at the front, said side walls each havingtop and bottom horizontal edges terminating short of the front of thecanopy and inclined edges one extending downwardly and forwardly fromthe front of the top horizontal edge and one extending upwardly andvforwardly from the front of the bottom horizontal edge;

a blower unit adapted for installation in said filter box through saidopen front for drawing gases into the box,

and for exhausting gases therefrom, a filter element extending betweenand removably mounted on the downwardly and forwardly inclined edges ofthe filter box side walls, a filter box cover extending between andremovably mounted on the upwardly and forwardly inclined edges of thefilter box side walls to substantially close the filter box so that allgases entering the box pass through the filter element, the top wall ofthe filter box being provided with an outlet opening for exhaustinggases from the filter box, interlocking means provided solely on thefilter element and the filter box side walls for releasably retainingthe filter element in position, interlocking means provided solely onthe filter box cover and filter box side walls for retaining the coverin position and permitting removal of the cover for access into 1 thefilter box, and means for mounting and releasably retaining the blowerunit in the filter box comprising interlocking parts provided solely onthe blower unit and the filter box, so that the cover is removable andattachable and the blower unit is mountable and dismountable without theaid of external means.

5. In a ventilating apparatus of the character described: an exhaustchamber formed of a rear wall, a top wall,

depending side walls, and a bottom wall and having an entrance openingfor admitting gases to be exhausted, 7

one wall of said chamber being formed with an outlet opening forexhausting gases from the chamber, a locking part extending downwardlyfrom the top wall of the exhaust chamber and having an upwardly andrearwardly facing surface defining with the topand rear walls of thechamber a confining space for use in mounting and re- 7 taining a blowerunit in the exhaust chamber, and a 7 said confining space and havingparts engageable with said abutment surfaces to releasablyretain theblower unitin'the exhaust chamber.

6. A ventilating hood, comprising: a canopy including a rear wall and atop wall and open at the bottom for collecting rising gases; a filterbox under the canopy for exhausting gases from the canopy including arear wall and a top wall formed respectively by portions of the rear andtop'walls of said canopy, depending side walls, and a bottom wall, saidside walls each having top and bottom horizontal edges terminating shortof the front of the canopy and inclined edges one extending downwardlyand forwardly from the front of the top horizontal edge and oneextending upwardly and forwardly from the front of the bottom horizontaledge; a remov able filter element extending between the downwardly andforwardly inclined edges of the filter box sidewalls, a removable filterbox cover mountable on and extending between the upwardly and forwardlyinclined edges of the filter box side walls to substantially close thefilter box so that all gases entering the box pass through thefilterelement, the top wall of the filter box beingp-rovided with anoutlet opening for exhausting gases from the filter box, interlockingmeans on the filter box cover and filterbox side walls for retaining thecover in position and permitting removal of the cover for access to thefilter box, a locking part extending downwardly from the top wall of thefilter box and having an upwardly and rear-- wardly facing surfacedefining with the top and rear walls of the filter box a confining'spacefor use in mount ing a blower unit in the filter box, and a locking partextending upwardly from the bottom wall of the filter box adjacent itsforward edge and having engageable forwardly facing and rearwardlyfacing abutment SUI- faces for use in mounting a blower unit in thefilterbox; and a blower. unit having a part receivable in said confiningspace and having parts engageable with said abutment surfaces toreleasably retain the blower unit in the filter box. v

7. In a ventilating apparatus of the character described, anexhaustchamber formed of a rear wall, a top wall,

depending side-walls, and a bottom wall, and having anopening'at thefront for admitting gases to the chamber and" for permittinginstallation of a blower unit in the chamber, the top wallofsaid-chamber being formed with an outlet opening for exhausting gasesfrom the cham-- her, ablower unit adapted for installation in theexhaust chamber through said front opening including amoton driven fanfor drawing gases into the exhaust chamber and an exhaust ducthaying anupper, terminal portion adapted to register with said outlet opening forexhausting" gases from the chamber, and means for releasably retainingthe blower unit in position in said chamber, comprising, a locking; partextending downwardly from the topwall of the exhaust chamber andhavingan upwardly and rearwardly facing surface definingwith the top and rearwallsof the'chamber a con-- fining space for usein mounting the-blowerunit in the exhaust chamber, a forwardly extending flange on theterminal portion of said outlet duct engageable with the chamber, thetopwall of said chamber beingformed with an outlet opening for exhausting.gases from the chamber, a blower unit adaptedfor installation in theexhaust chamber through said front opening: including a motor'driven fanfor drawing gases into: the exhaust chamber and an exhaust duct havinganupper, terminal. portion adapted to register with said outlet openingfor exhausting gases from the chamber, and means for releasablyretaining the blower unit in, position in said exhaust chamber,comprising, interengageable parts on the blower unit and the top wall ofsaid exhaust chamber forming a. disengageable pivotal connectionpermit-s ting pivotal movement of the blower unit on said: top

wall in one direction for removal of the unit, and av locking part onthe forward edge of the bottom wall of the exhaust chamber havingengageable forwardly facing and. rearwardly facing abutment surfaces foruse inmounting said blower unit in the exhaust chamber, an abutment parton the blower unit engageable with said: forwardly facing abutmentsurface, and a hook on the blower unit engageable with said rearwardly.facing abut.-

ment surface for maintaining said abutment part in engagement with theforwardly facing abutment surface.

9. In a ventilating apparatus of the character described,

' an exhaust chamber formed of a rear wall, a top wall,

depending side walls, and a bottom wall, and having an. opening at thefront for admitting gases tothe chamber and for permitting installationofa blower unit in the chamber, the top wall of said chamber beingformed with an outlet opening for exhausting gases from the chamber, ablower unit adapted for installation in the exhaust chamber through saidfront opening; including a fan motor, afan wheel mounted on the motorshaft: to be; driventhereby, a scroll' shaped fan housing secured.

..to the motor housing and encasing the fan wheel, said scroll shapedfan wheel housing. having an axial. inlet opening at one side throughwhich gases are drawn into the housing and a tangentially directedupwardly ex.- tending terminal portion forming an outlet. duct adapted.to register with said outlet opening for exhausting gasesfrom thechamber, and means for releasably retaining. theblower unit inposition-in said exhaust. chamber, comprising, interengageable parts onthe blower unit and the. top wall of said exhaust chamber forming, a.disengage.- able' pivotal connection permitting pivotal movement, of

. the blower unit on said top wall in one directionfor face parallel tothe fan wheel axis for use. inmounting said surface for retaining theend of the exhaust duct in position between said surface, said top walland said rear wall but permitting pivotal movement of the blower unitabout the point of engagement between said flange and said surface in adirection forwardly and away from said top wall for removal of the unit,and cooperating parts on the blower unitand. the bottomwall of said herand for permitting installation of a blower unit in;

the blower unit in said ventilating hood engageable with said forwardlyfacing abutment surface on said locking part, anda, hook pivotallymounted on the wiring box for latching engagement with said rearwardlyfacing surface onsaid locking part for maintaining said wiring boxinabutting relationship with said locking part.

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